Insulator support



May 23, 1933. Q MlLLER 1,911,031

INSULATOR SUPPORT Filed June 28, 1950 mnQLIIIIIIHI umignm INVENTOR.

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HIS ATTORNEYS V Patented May 23, 1933 UNITED STATES PATENToFFlcE CHARLES E. MILLER, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO HUBBARD AND COMPANY, A CORPORATION OF PENNSYLVANIA INSULATOR SUPPORT Application filed June 28,

This invention relates to insulator supports and more particularly to that type of support in which a thimble in the form of a wire helix is provided for receiving the insulator.

The present invention is in the nature of an improvement over the insulator support illustrated and described in Patent No. 1,158,149, granted to Charles L. Pierce, Jr., October 26, 1915.

In the structure of the foregoing patent, the rigid supporting stem or bracket which receives the thimble or Wire helix is formed with holes spaced a predetermined distance apart in accordance with the length of the helix, and the opposite ends of the helix or coil are deflected inwardly and project into these holes when the helix is mounted on said stem or bracket. The holes which receive the ends of the helix are enlarged laterally of the stem, so that the ends of the helix have a certain amount of lateral play, to permit a certain amount of lateral compression of the helix when an insulator is screwed thereon. If, then, the insulator is given a resilient mounting, the top of the insulator should be protected from the top of the stem or bracket.

In the present form of insulator support, the helix is secured to the stem at a point below the upper end of the helix and above the lower end thereof, the top or upper extremity of the helix protruding above the top of the rigid stem, thereby providing resilient portions both above and below the point of securement. The insulator is thus given an entirely resilient or cushioned mounting and at the same time the top of the insulator is prevented from contacting with the top of the rigid stem or bracket.

In the drawing 2- Figure 1 is a View in elevation of an insulator stem with the improved type of helix thimble thereon, and

Fig. 2 is a view, principally in transverse vertical section, of the stem and thimble,

showing an insulator mounted thereon.

The insulator stem or bracket, which may be of any suitable type, is indicated at 5, and a substantially cylindrical insulator-receiving helix or thimble at 6. The insulator stem 1930. Serial N0. 464,621.

5 is provided with a hole or recess 7 and a slot or recess 8. The hole or recess 7 receives the lower inwardly-deflected end projection or lug a of the helix, as will be readily understood by referring to Fig. 2 of the drawing.

In practice, the hole or recess 7 is located at such a point in the body of the stem 5, that the lower end a of the helix or thimble 7 will register therewith when in operative position on the stem. The recess or slot 8 is preferably located adjacent to the upper end of the stem 5 as will be apparent from the following description of the thimble or helix.

The improved features, in combination with lug a and recess 7, include the forming of an inward projection, lug or catch 9 in one of the coils of the helix below the top thereof, this catch engaging in the slot or recess 8 formed in the stem 5. As shown in the drawing one turn of the upper extremity of the helix projects above the top of the rigid stem or support 5, as at 10, and prevents the top of the insulator from contacting with the top of the stem and ensures a resilient or cushioning mounting for the insulator under any circumstances without sacrificing any of the advantages enumerated in the patent above noted.

While various modifications and changes may be made in the insulator supports herein disclosed without departing from the spirit and scope of the invention, it is to be understood that only such limitations shall be placed on the invention as are imposed by the prior art and the appended claim.

What I claim as new and desire to secure by Letters Patent is:

The combination with an insulator supporting pin having a recess in the body thereof and a recess therein near to one end thereof, of an insulator-receiving thimble on said pin, said thimble comprising a substantially cylindrical helix of yieldable wire having a lug at one end thereof disposed in the body recess of the pin and a lug, located between said first mentioned lug and the other end of said helix, disposed in the other of said recesses, said thimble having approximately one turn of the helix disposed beyond the end of said pin the portion of the thimble extending beyond the end of the pin being of substantially the same diameter as that portion lying between the lugs.

In testimony whereof, I have hereunto subscribed my name this 9th day of May, 1930.

CHARLES E. MILLER. 

